There is provided a receptacle device for a mask, the receptacle device comprising: a valve; a body portion surrounding the valve; and an anchor portion; wherein the body portion and the anchor portion are integrally formed; and wherein the anchor portion and the body portion define a channel therebetween, and the channel is configured to releasably engage the mask. A method of manufacturing a mask assembly or retrofitting a receptacle device to a workpiece mask is also provided which comprises a mask and said receptacle device.